Additives for Rubber Sealants
What’s a Rubber Sealant?
A rubber sealant is a type of sealing material made primarily from rubber. It is generally produced by mixing rubber with additives such as softeners, curing agents, reinforcing fillers, and antioxidants. You can enhance the performance of rubber sealants by adding specialized additives. Rubber sealants are widely used in the sealing and bonding of machinery, instruments, building components, and automobile parts to prevent the intrusion of dust, water, and gas into internal mechanisms. This helps achieve purposes such as waterproofing, sealing, sound insulation, insulation, and buffering.
Minor difference between Rubber Sealants and Adhesives
While adhesives are used to create bonds between two different or similar materials, sealants are designed to create an impenetrable barrier to gas or moisture.
Main Types of Rubber Sealants
- Butyl Rubber Sealant
- Butyl rubber sealant is made from isobutylene polymer, which is known for forming the strongest bonds. It is typically used for sealing concrete and metal. Butyl sealants offer excellent weather aging resistance, heat resistance, acid and alkaline resistance, and good electrical insulation properties. They are widely used in machinery, glass installation, cable joints, and other construction applications.
- Silicone Rubber Sealant:
- Silicone rubber sealant can be used in a wide temperature range (65°C to 250°C). It also has excellent weather aging resistance and electrical insulation properties. This type of sealant is particularly suitable for elastic bonding in applications with strict temperature requirements, such as electronic components, appliances, refrigeration equipment, and automobiles.
- Polysulfide Sealant:
- The molecular weight of liquid polysulfide rubber is around 1000-5000 g/mol. It has various end groups (such as hydroxyl, halogen, and amide), which provide minimal molding shrinkage. Polysulfide rubber sealant offers good oil and chemical resistance and soft insulation. It is widely used as a sealing material in civil engineering and the automotive industry. It can also be applied in oil tanks, fuel tanks, and composite glass seals.
- Chloroprene Rubber Sealant:
- Chloroprene sealants have strong initial bonding strength and are cost-effective. They are primarily used for sealing wood, aluminum, and plastic but are not suitable for polystyrene foam materials.
Commitment to Quality
We are committed to providing a variety of additive formulas for rubber sealant materials. The thermo-stability, aging resistance, and UV light resistance of rubber sealants can be further enhanced by adding Omnistab additives. This extends the sealant’s service life while maintaining high elasticity.
| Product | CAS no. | Key benefits |
| OMNISTAB AN 1726 | 110675-26-8 | A multi-functional phenolic antioxidant that provides thermal stability for various elastomer sealants (e.g., NR, CR, BR). |
| OMNISTAB AN 1520 | 110553-27-0 | An eco-friendly antioxidant for rubber. It performs well in thermo-oxidative aging resistance, both during processing and under long-term high-temperature conditions. |
| OMNISTAB AN 800 | 123-28-4 | A thioester secondary antioxidant that improves protection when used with the above two additives. |
| OMNISTAB UV BP12 | 1843-05-6 | Has good absorption in the UVB region and excellent compatibility with rubbers. |
| OMNISTAB UV 1 | 57834-33-0 | A liquid UV absorber that effectively blocks UVB and UVA band |
Frequently asked questions
Rubber sealants are commonly used in machinery, automobile parts, building components, and instruments to prevent the intrusion of dust, water, and gas. They serve a variety of purposes, including waterproofing, sound insulation, electrical insulation, and buffering.
Yes, some rubber sealants, like silicone rubber sealants, are designed to withstand a wide range of temperatures, typically from -65°C to 250°C. This makes them ideal for applications in electronics, automotive, and refrigeration industries.
Some rubber sealants, like those containing Omnistab AN 1520, are eco-friendly and designed to be more sustainable. They perform well in both processing and under high-temperature conditions, offering good thermo-oxidative aging resistance without harmful effects.
You can enhance the performance of rubber sealants by adding specialized additives such as Omnistab, which improve properties like UV resistance, aging resistance, and thermo-stability, leading to a longer service life and better elasticity.
Rubber sealants are generally easy to apply. However, the surface preparation and application method will depend on the type of sealant being used. It’s important to follow manufacturer guidelines for the best results.
The lifespan of a rubber sealant depends on factors such as environmental conditions, exposure to UV light, temperature, and the type of additives used. Sealants with added OMNISTAB additives, for example, offer improved durability, with longer service lives and better resistance to aging.
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